The extension can be found in the Edit->Find and Replace menu. It only loads when first used so it won't touch your Visual Studio performance. It may take a couple of seconds for large solutions to cache all the file information when used for the first time.

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This is not a code search but an extension to make finding specific files quick and easy. This is something I need to use all the time...Installed (And if you just want the vsix, you can get it via the Visual Studio Gallery here, VSFileNav)